Heater



FIG. 1 is a perspective front view of the heater in accordance with the design of the present invention;

FIG. 2 is a front elevational view of the heater of FIG. 1;

FIG. 3 is a rear elevational view of the heater of FIG. 1;

FIG. 4 is a top plan view of the heater of FIG. 1;

FIG. 5 is bottom plan view of the heater of FIG. 1;

FIG. 6 is a right-side elevational view of the heater of FIG. 1; and,

FIG. 7 is a left-side elevational view of the heater of FIG. 1. 

The ornamental design for a heater, as shown and described. 